Chlorine gas can be prepared in laboratory with hydrochloric acid and manganese-dioxide.


Method

Put manganese lump in a round flask , now put concentrated hydrochloric acid into the round flask with 엉겅퀴 훈장, 엉 겅 퀴 funnel and fit the flask with cork having a hole ,Now attach a tube into the hole of cork and leave to tube into an empty container,so the gas can be collected.The container must be sealed with cork having only one hole for the attachment of tube (from flask to container).Set the apparatus and there should be no leakage.Now heat the manganese lump and hydrochloric acid with a bunsen burner...

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레몬 주스 is acidic and weakens paper. When paper
is heated, the remaining acid turns the 글쓰기 brown
before discoloring the paper.
Difficulty: Easy
Time Required: A Few Minutes
Here's How:
Tips:
What 당신 Need
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Chemistry
1. Squeeze lemons to
obtain their 주스 or
obtain bottled lemon
juice.
2. Use the 주스 as 'ink'
by applying it to a
stick 또는 paintbrush
and 글쓰기 on paper.
3. Allow the paper to
dry.
4. When 당신 are ready to
read your invisible
message, hold the
paper up to sunlight,
a lightbulb
(recommended),...

What would life would be like if nobody had ever studied
chemistry? It’s easy to grumble about the homework,
but it’s impossible to overestimate chemistry’s
importance in our daily lives.
What Would Your 집 Be Like?
The International 우주 Station with ATV-2 and
Endeavour (Image ESA and NASA)
Look around your 집 and count the number of things
around 당신 that have come out of chemistry
breakthroughs and inventions. Without chemistry we
wouldn’t have light bulbs, mobile phones, 페이스북 or
Twitter. Much of the 음식 we eat and clothes we wear
involve chemists and chemistry too.
If we had never...